I'm sorry to say but... you're a jerk. If someone's fighting (or healing after obviously just fought) next to a node then the node is theirs.
Even in situations like BH when you can grab the node without agro-ing the mob, if someone's engaged with the mob, it's polite to wait to see if they want the node.
Honestly, I wonder how people are brought up today.
Go read his post again. How was he being a jerk?
In the first instance they both arrived at the area at the same time
. Most people go for the crate first and that's what he did.
In the second insance, the group was done fighting and just standing around. They should have harvested the node if they wanted it. Why just stand around and not harvest it if you want it?